Backplate



FIG. 1 is a front view of a backplate showing my new design, the rear being unornamented;

FIG. 2 is a bottom view thereof, the top being a mirror image;

FIG. 3 is a left end view thereof, both ends being identical; and,

FIG. 4 is a sectional view taken in the direction of the arrows on line 4--4 of FIG. 1. 

The ornamental design for a backplate, as shown and described. 